Enantioselective Alkynylation of Isatin Derivatives Using a Chiral Phase-Transfer/Transition-Metal Hybrid Catalyst System

ACS Catalysis ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 2395-2399 ◽  
Author(s):  
Suva Paria ◽  
Hyo-Jun Lee ◽  
Keiji Maruoka
Keyword(s):  
Transition Metal ◽  
Phase Transfer ◽  
Catalyst System ◽  
Hybrid Catalyst ◽  
Chiral Phase ◽  
Isatin Derivatives

scholarly journals Chiral Quaternary Ammonium Salt Derived from Dehydroabietylamine: Synthesis and Application to Alkynylation of Isatin Derivatives Catalyzed by Silver

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1479
Author(s):  
Guanyu Jiang ◽  
Xinduo Sun ◽  
Fanrui Zhou ◽  
Kun Liang ◽  
Qian Chen
Keyword(s):  
Transition Metal ◽  
Asymmetric Catalysis ◽  
Renewable Resources ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Abietic Acid ◽  
Phase Transfer ◽  
Fine Chemicals ◽  
Triethyl Amine ◽  
Isatin Derivatives

Abietic acid and its derivatives have broadly been used in fine chemicals and are renewable resources. Its inherent chiral rigid tricyclic phenanthrene skeleton is unique. Its utilities in asymmetric catalysis remain to be explored. A series new amide-type chiral quaternary ammoniums bearing dehydroabietylamine were designed, and prepared by two convenient steps. Acylation of dehydroabietylamine with bromoacetyl chloride afforded amide holding bromoacetyl group in higher yields using triethyl amine as base. Subsequent quaternization reaction gave the desired amide-type chiral quaternary ammoniums. The new chiral quaternary ammoniums can be used as phase-transfer catalyst (PTC) for the transition metal-catalysed alkynylation of isatin derivatives.

Phase-transfer-assisted confinement growth of mesoporous MoS2@graphene van der Waals supraparticles for unprecedented ultrahigh-rate sodium storage

2021 ◽  
Author(s):  
Wenqian Han ◽  
Guannan Guo ◽  
Yan Xia ◽  
Jing Ning ◽  
Yuwei Deng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Anode Materials ◽  
Phase Transfer ◽  
Transition Metal Dichalcogenides ◽  
Rate Capability ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Metal Dichalcogenides ◽  
Sodium Storage ◽  
Low Rate

Transition metal dichalcogenides (TMDs) are promising anode materials for sodium-ion batteries (SIBs), but suffer from low rate capability and poor cycling stability. Here, we describe our efforts in designing a...

Metathetical Degradation and Depolymerization of Unsaturated Polymers

1997 ◽  
Vol 70 (3) ◽  
pp. 519-529 ◽  
Author(s):  
J. C. Marmo ◽  
K. B. Wagener
Keyword(s):  
Molecular Weight ◽  
Transition Metal ◽  
Catalytic System ◽  
Lewis Acid ◽  
Catalyst System ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Side Reactions

Abstract The employment of transition metal catalysts has been a viable route in the degradation and depolymerization of unsaturated polymers. Initially, unsaturated polymers were degraded with a catalytic system containing a transition metal and a Lewis acid cocatalyst (WCl6/SnBu4). Degradation chemistry was effective in reducing the molecular weight of the polymer, however, the classical catalyst system induces side reactions which generates ill-defined products. These side reactions were obviated by using a preformed alkylidene without a Lewis acid cocatalyst, and perfectly difunctional telechelics were synthesized.

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